package org.apache.maven.model.path;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.codehaus.plexus.component.annotations.Component;

/**
 * Normalizes a URL.
 * 
 * @author Benjamin Bentmann
 */
@Component(role = UrlNormalizer.class)
public class DefaultUrlNormalizer implements UrlNormalizer {

  public String normalize(String url) {
    String result = url;

    if (result != null) {
      while (true) {
        int idx = result.indexOf("/../");
        if (idx <= 0) {
          break;
        }
        int parent = idx - 1;
        while (parent >= 0 && result.charAt(parent) == '/') {
          parent--;
        }
        parent = result.lastIndexOf('/', parent);
        if (parent < 0) {
          break;
        }
        result = result.substring(0, parent) + result.substring(idx + 3);
      }
    }

    return result;
  }

}
